Sea to Summit Hamelin Synthetic -1 °C

Name: Sea to Summit Hamelin Synthetic -1 °C
Brand: Sea to Summit
Availability: InStock

Roomy relaxed-mummy synthetic bag, ISO comfort +3 °C, with a second half zip for venting.

Best price found

£144.99

at Ultralight Outdoor Gear · In stock · RRP £169.99

Prices checked 31 October 2026. We may earn a commission on these links.

Specifications

Weight: 1,124 g (Maker spec table, regular (fits to 185 cm). Same page's highlights give 1220 g packed; Ultralight Outdoor Gear lists Regular 1189 g, Long 1298 g.)
Packed size: 8.4 L compressed volume
Comfort: Comfort +3 °C / limit -1 °C
Insulation: Revive Loft recycled polyester (RCS), 710 g fill
Season rating: 2–3 season
Shell & zip: Bluesign-approved recycled polyester shell and lining, PFC-free DWR (20D per tech specs; feature list says 50D)
Rating Standard: ISO 23537 rating
Fill Note: Regular 710 g, Long 805 g (Ultralight Outdoor Gear). Offset insulation layers.
Zip: Left full-length YKK #5 two-way zip through the footbox, plus right half-length two-way zip

Ultralight Outdoor Gear: relaxed fit 'feels less restrictive than most mummy-style designs'
Twin zips allow 'excellent venting options or even converting the bag into a quilt' (Ultralight Outdoor Gear)
ISO-tested ratings and recycled, bluesign-approved fabrics and fill
'At 1189g (Regular), it's on the heavier side' (Ultralight Outdoor Gear)
8.4 L compressed volume is bulky next to a down bag of similar warmth